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CN-121976406-A - Dyeing process of tencel/flax blended yarn for light and thin jean fabric

CN121976406ACN 121976406 ACN121976406 ACN 121976406ACN-121976406-A

Abstract

The invention discloses a dyeing process of tencel/flax blended yarns for light and thin jean fabrics, which comprises warp yarn preparation and warp beam dyeing, wherein prewetting, multi-stage indigo dyeing, mild oxidation and alternate washing, aftertreatment and drying are sequentially carried out, and the warp beam dyeing comprises a prewetting groove, at least four dyeing grooves, an oxidation zone, a washing groove and a aftertreatment groove. By controlling the dyeing liquid to be in weak alkalinity, low temperature and low tension technology, the chemical damage and physical stretching of tencel fiber are reduced, and fuzzing and broken ends are reduced. The pretreatment activates the fiber and the concentration of the dye liquor with gradually decreasing gradient is fully oxidized, so that the diffusion of the dye into the fiber is promoted, a good dye penetration effect is realized, the color light is pure, and the uniformity of the color is ensured. The post-treatment softening process improves the weavability of the yarn. Hydrophilic softness and crease-resistant finishing, and endows yarn with soft and plump hand feeling, and perfectly meets the comfort requirement of light and thin jeans.

Inventors

  • ZHOU WAN
  • WU YANMING
  • SHU HUI

Assignees

  • 江阴芗菲纺织科技有限公司

Dates

Publication Date
20260505
Application Date
20251231

Claims (6)

  1. 1. The dyeing process for the tencel/flax blended yarn of the light and thin jean fabric is characterized by comprising the following steps of: (1) Warp preparation, namely warping tencel/flax blended yarns serving as warp yarns on a warp beam at low tension; (2) The warp beam dyeing, namely, the warp beam prepared in the previous step is sent into a warp beam dyeing machine, and prewetting, multi-stage indigo dyeing, mild oxidation, alternate water washing, post treatment and drying are sequentially carried out; warp yarn sequentially passes through a pre-wetting groove, at least four dyeing grooves, an oxidation area, a washing groove and a post-treatment groove; The temperature of the prewetting tank is 40-60 ℃, and the prewetting tank contains 1.5-2.5g/L of pectase, 0.5-1.0g/L of cellulase and 1-3 g/L of efficient penetrating agent, and is treated for 50-70 minutes, and the temperature is raised to 85 ℃ for inactivating enzyme for 10 minutes after the treatment, and the prewetting tank is fully washed; the dyeing tanks are indigo reduction dyeing liquids, the pH value of the dyeing liquids is controlled to be 11.0-11.8, the dosage of sodium hydrosulfite is 12-18g/L, and the temperature is 25-35 ℃, and each dyeing tank enters an oxidation zone for mild oxidation after padding; the post-treatment tank adopts 2.0-3.0% of hydrophilic organic silicon softener and 1.0-2.0% of anti-wrinkle agent, and the temperature is 40-50 ℃; the drying adopts hot air drying, and the temperature is controlled between 100 ℃ and 110 ℃.
  2. 2. The dyeing process for tencel/flax blended yarns for light and thin jean fabric as claimed in claim 1, wherein the low tension in warp warping is 15-20 cN/tex.
  3. 3. The dyeing process for tencel/flax blended yarns of light and thin jean fabric as claimed in claim 1, wherein in the step (2), the concentration of indigo in the plurality of dyeing tanks is gradually decreased, the concentration of indigo in the first dyeing tank is 1.5-4.0 g/L, and the concentration of each dyeing tank is gradually decreased by 20% -40%.
  4. 4. The dyeing process for tencel/flax blended yarns of light and thin jean fabric as claimed in claim 1, wherein in the step (2), the roller pressure of each dyeing groove is set to be properly low, so that the warp yarn liquid carrying rate is stabilized between 70% and 85%.
  5. 5. The dyeing process for tencel/flax blended yarns of light and thin jean fabric of claim 1, wherein in step (2), mild oxidation means at least 4 static air oxidation and 2 cold water washes.
  6. 6. The dyeing process for tencel/flax blended yarn for light and thin jean fabric as claimed in claim 1, wherein the blending ratio of tencel to flax is 30/70 to 70/30.

Description

Dyeing process of tencel/flax blended yarn for light and thin jean fabric Technical Field The invention relates to the technical field of textile dyeing and finishing, in particular to a dyeing process of tencel/flax blended yarns for light and thin jean fabrics. Background Denim fabric is popular because of its sturdiness, wear resistance and rough style. The traditional jean fabric is mainly prepared by taking pure cotton as a raw material and interweaving indigo warp yarns and white weft yarns. With the increasing demands of consumers for clothing comfort, functionality and diversity, the development of novel light and thin jean fabrics with unique hand feel, appearance and service properties is an industry trend. The tencel (Lyocell) is an environment-friendly regenerated cellulose fiber, has the advantages of smoothness, sagging and good air permeability, and the flax fiber has the advantages of moisture absorption, sweat release, dryness and natural unique texture. The two fibers are combined, and spandex is added to endow elasticity, so that the high-grade, comfortable and high-added-value elastic light and thin jean fabric can be created. However, the application of tencel and flax to denim fabric, especially in the traditional warp beam pad dyeing process, faces a number of technical challenges: (1) Fiber sensitivity-tencel fiber is very easy to expand in wet state, is sensitive to tension and pH value, and is easy to break due to high tension, and the fiber is damaged due to improper pH value. Flax fibers are high in rigidity and high in hairiness, and are easy to be rubbed and hooked in the weaving process, so that the efficiency is low and the cloth surface is defective. (2) The process complexity is that vat dye dyeing needs to undergo a plurality of steps of reduction, leuco dye-uptake, oxidation, soap boiling and the like, and has a plurality of process control points and high requirements on equipment and operation. (3) Dyeing uniformity, namely, the flax fiber has high crystallinity and orientation degree, has poor dye adsorptivity as cotton, and is easy to cause the problems of color mark, chromatic aberration and the like if the dyeing process is controlled improperly after being blended with tencel. (4) The hand feeling is deteriorated, and the intense chemical treatment and oxidation process easily lead the yarn to have thick and hard hand feeling, which is contrary to the soft and comfortable touch feeling pursued by the light and thin jean fabric. In the prior art, the dyeing process for pure cotton or common chemical fiber jean fabric is mature, but the dyeing process for the warp beam of the light and thin jean fabric specially aiming at tencel/flax blending is lacking. If the traditional technology is directly applied, the problems of weft yarn damage, elasticity loss, difficult weaving, poor cloth cover quality and the like are caused. Therefore, development of a special dyeing process which can give consideration to the fiber characteristics and ensure the dyeing quality is urgently required. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a dyeing process for tencel/flax blended yarns of light and thin jean fabrics. The process realizes low tension, mild chemical environment and precise control by optimizing the whole process parameters of beam dyeing, effectively overcomes the potential damage to fibers while fully playing the advantages of high color fastness of vat dye, ensures strong yarn and soft hand feeling, and is particularly suitable for the production of high-grade light and thin jean fabrics. In order to solve the technical problems, the aim of the invention is realized as follows: The invention relates to a dyeing process of tencel/flax blended yarn for light and thin jean fabric, which comprises the following steps: (1) Warp preparation, namely warping tencel/flax blended yarns serving as warp yarns on a warp beam at low tension; (2) The warp beam dyeing, namely, the warp beam prepared in the previous step is sent into a warp beam dyeing machine, and prewetting, multi-stage indigo dyeing, mild oxidation, alternate water washing, post treatment and drying are sequentially carried out; warp yarn sequentially passes through a pre-wetting groove, at least four dyeing grooves, an oxidation area, a washing groove and a post-treatment groove; The temperature of the prewetting tank is 40-60 ℃, and the prewetting tank contains 1.5-2.5g/L of pectase, 0.5-1.0g/L of cellulase and 1-3 g/L of efficient penetrating agent, and is treated for 50-70 minutes, and the temperature is raised to 85 ℃ for inactivating enzyme for 10 minutes after the treatment, and the prewetting tank is fully washed; the dyeing tanks are indigo reduction dye solutions, the pH value of the dye solutions is controlled to be 11.0-11.8, the dosage of sodium hydrosulfite is 12-18g/L, and the temperature is 25-35 ℃, and each dyeing tank enters an oxidation area for mild ox